How to make a hair look normal or not blocky
Below is an image of how I connected the maps for just the hair. I'm sure you figured out by now (It took me a minute) that the suffix letter to the map name refers to what kind of map it is (Ex: M = Metallic, N = Normal, C = Color, and A = Alpha). What threw me for a second is that unlike common setups which have the alpha as a built-in component of the basecolor map, this one uses a separate map, using the color, not the alpha value. See below:

Also - note the blend modes I highlighted on the right side. You can play with them to your liking, just don't pick opaque - that will leave things opaque and &quot;blocky&quot; as you said.
NOTE -  I just noticed, in the image I provided, the metallic map is set to sRGB color space, this should be non-color.
Hope this helps